2. Basic Chemistry…putting it all together Atoms, valence electrons Ionization energy and reactivity Molecular mass (weight) Chemical equations and “balancing” Formula mass Feedrates and concentrations pH

3. Example: HOCl and Water Same number of atoms per molecule Chlorine substituted for hydrogen – Chlorine is more electronegative…table 3.3 p19 Dissociation of both is likely H H O O H H O O H H Cl

5. Dissociation Both molecules will be impacted by pH Chlorine as an ion (hypochlorous acid) “looks” less like hydroxide than HOCl does to H 2 O O O H H Cl - + H H O O H H - + O O H H H H O O H H